Ensure that we can repeatedly set an expando on a plugin object

Ensure that we can repeatedly set an expando on a plugin object

Just checking whether the holder has the property in the setter
interceptor doesn't work, as this will invoke the get interceptor.

BUG=691142
TBR=haraken@chromium.org

Review-Url: https://codereview.chromium.org/2736783002
Cr-Commit-Position: refs/heads/master@{#455109}
(cherry picked from commit 7acd424e3b6884424a4ab9df5ca9c8ab0f5a074d)

Review-Url: https://codereview.chromium.org/2745483002 .
Cr-Commit-Position: refs/branch-heads/3029@{#81}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/bd3dc76cf5f0040beefa918e56277e2867294c4c

[jochen (gone - plz use gerrit), 2017-03-09 08:03:43]

Description was changed from

==========
Ensure that we can repeatedly set an expando on a plugin object

Just checking whether the holder has the property in the setter
interceptor doesn't work, as this will invoke the get interceptor.

BUG=691142
TBR=haraken@chromium.org

Review-Url: https://codereview.chromium.org/2736783002
Cr-Commit-Position: refs/heads/master@{#455109}
(cherry picked from commit 7acd424e3b6884424a4ab9df5ca9c8ab0f5a074d)
==========

to

==========
Ensure that we can repeatedly set an expando on a plugin object

Just checking whether the holder has the property in the setter
interceptor doesn't work, as this will invoke the get interceptor.

BUG=691142
TBR=haraken@chromium.org

Review-Url: https://codereview.chromium.org/2736783002
Cr-Commit-Position: refs/heads/master@{#455109}
(cherry picked from commit 7acd424e3b6884424a4ab9df5ca9c8ab0f5a074d)

Review-Url: https://codereview.chromium.org/2745483002 .
Cr-Commit-Position: refs/branch-heads/3029@{#81}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/bd3dc76cf5f0040beefa918e5627...
==========

[jochen (gone - plz use gerrit), 2017-03-09 08:03:44]

Committed patchset #1 (id:1) manually as
bd3dc76cf5f0040beefa918e56277e2867294c4c.